[VPlan] Add missing VPWidenSelectto VPRecipeWithIRFlags::classof (NFC).

Add missing entry to VPRecipeWithIRFlags. NFC currently as it is never
called on VPWidenSelectRecipes currently.

Author: fhahn

llvm/lib/Transforms/Vectorize/VPlan.h

@@ -847,6 +847,7 @@ struct VPRecipeWithIRFlags : public VPSingleDefRecipe, public VPIRFlags {
            R->getVPDefID() == VPRecipeBase::VPWidenCallSC ||
            R->getVPDefID() == VPRecipeBase::VPWidenCastSC ||
            R->getVPDefID() == VPRecipeBase::VPWidenIntrinsicSC ||
+           R->getVPDefID() == VPRecipeBase::VPWidenSelectSC ||
            R->getVPDefID() == VPRecipeBase::VPReductionSC ||
            R->getVPDefID() == VPRecipeBase::VPReductionEVLSC ||
            R->getVPDefID() == VPRecipeBase::VPReplicateSC ||